Month: July 2016

No.6. How crude oil is refined? Explain the important fractions of petroleum along with their usage. Answer. Crude oil is refined by fractional distillation in a fractionating tower. Important Fractions of Petroleum Each fraction is not a single compound. Rather Read More …

No.4. Write a note on fractional distillation of petroleum. Answer. The crude oil is refined in the refineries. Refining process is the separation of crude oil mixture into various useful products (fractions). It is carried out by a process Read More …

No.3. Write a detailed note on Ammonia Solvay process. Answer. Principle of Solvay process lies in the low solubility of sodium bicarbonate at low temperature i.e. at 15°C. When CO2 is passed through an ammonical solution of NaCl called ammonical Read More …

No.16. What is the difference between crude oil and residual oil? Answer. Crude oil is the dark brownish viscous liquid formed by decomposition of remains of dead plants and animals in the absence of air because of high pressure, temperature Read More …

No.7. What happens when ammonical brine is carbonated? Answer. Ammonical brine is fed into carbonating tower and carbon dioxide is passed through it. Following reactions take place in the carbonating tower. CO2(g) + NH3(g) + H2O NH4HCO3(1) NH4HCO3(1) + NaCl Read More …

No. v. What do you mean by a fraction of petroleum? Answer. Fraction of petroleum means a part of petroleum that is a mixture of hydrocarbons having different number of carbon atoms in it. Each fraction has its specific name, Read More …

No.iv. Give the reaction of formation of ammonia in the process. Answer. It is prepared by the Haber’s process. One volume of nitrogen (from air) and three volumes of hydrogen (obtained by passing methane and steam over heated nickel catalyst) Read More …

No. vii. Mention the chemical reaction for the formation of metallic copper in the bessemerization process. Answer. In the bessemerization process molten matte is further heated. Molten matte is mixed with sand and heated with a hot blast of air Read More …

No. i. Define concentration process used in metallurgy of copper. Answer. The process of removal of gangue from the ore is technically known as concentration and the purified ore is called the concentrate. The concentration process used in metallurgy of Read More …

No.8. What is water pollution? Describe the effects of using polluted water. Answer. Water pollution is a contamination of water bodies (e.g. lakes, rivers, oceans and ground water). Water pollution occurs when pollutants are discharged directly or indirectly into water Read More …

No.6. Explain five important waterborne diseases. How can these be prevented? Answer. The important waterborne diseases are (i) Diarrhea diseases. Intestinal diseases, such as cholera, that may cause dangerous dehydration. Diarrhea may be caused by viruses, bacteria, or parasites. Read More …

No.4. Justify the statement: house hold water is the reason of water pollution. Answer. Use of detergents is increasing day by day for cleaning purposes in houses-and industries. It is because; detergents have strong cleaning action than that of soap Read More …